package hashmap;

import java.util.HashMap;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * @author cyt
 * @create 2020-06-21 下午 9:24
 */
public class HashMapTest {

    public static void main(String[] args) {
        HashMap<Object, Object> map = new HashMap<>(3);
        map.put("a", "a");
        map.put("b", "c");
        map.put("c", "d");
        map.put("d", "e");


        System.out.println(map.size());
        System.out.println(map.get("a"));
        System.out.println(1 << 30);
        System.out.println("cyt".hashCode());
    }
}
